Grease gun cartridge



, Jan. 10, 1950 A. w. M CARTY I 2,493,

, GREASE GUN CARTRIDGE Filed July 31, 1944 2 Sheets-Sheet 1 FIGJ' Jan. 10, 1950 A. w. MGCARTY GREASE GUN CARTRIDGE 2 Sheets-Sheet 2 Filed July 31, 1944 FIG. 1

Patented Jan. 10, 1950 UNITED STATES PATENT OFFICE 2,493,891 GREASE GUN CARTRIDGE Arch W. McCarty, Tecumseh, Okla. Application July 31, 1944, Serial No. 543,489

' I 6 Claims.

The invention relates to cartridges for containing a plastic substance for use in grease guns, caulking guns, and the like.

At the present time considerable inconvenience is encountered in loading grease gun's, due to the nature of the hard oil, or grease, which makes it exteremely messy to handle from fa bucket or other container into the gun barrel.

Cartridges, containing the grease and which fit in the gun barrel, have heretofore been used to ship and handle the commodity in a clean manner. So far as I have been able to ascertain, such cartridges fall in one of two general classes, either the rigid cartridge, or the collapsible one.

' The rigid cartridges are usually made of heavy or comparatively thick card-board, and have a slidable metal follower or plunger in one end, and anexhaust opening for grease atthe other. In such cases the plunger in the grease or caulking gun acts to force the follower toward the exhaust opening of the cartridge. Such cartridges are more expensive than necessary, since their walls must be sufliciently rigid to closely envelop the follower without any deformation, even though considerable pressure is exerted by the gun plunger upon the plastic commodity therein.

The collapsible type cartridge is usually constructed of a thin tough material such as oiled paper or cellophane. When inserted in the gun barrel, the exhaust end is opened, and thereafter, the gun plunger acts to collapse the cartridge longitudinally to extrude the plastic commodity through the gun nozzle. 'Such a cartridge causes a waste of the grease, due to the fact that the collapsed material of the cartridgeprevents all of the commodity from being forced out of the gun- When the collapsed cartridge is removed from the gun barrel, 3. quantity of the commodity is also removed, unused, and wasted.

The prime object of the present invention is to provide a cartridge of the class described which will be cheap to manufacture, and which will also permit usage of all of they plastic commodity originally contained therein.

Another object. isto provide a cartridge of this class which may be easily and quickly removed from the gun barrel after itscontents have been exhausted.

A further object is to provide a cartridge which will preserve the contents against atmospheric action and leakage.

Other objects will be apparent from the follow ing description when taken in connection with :55

the accompanying two sheets of drawings, where: in:

Figure l is an elevational view of the cartridge in prone position;

Figure 2 is a fragmentary vertical sectional view detailing the closure for the exhaust end of the cartridge;

Figure 3 is a similar view through the other end of the cartridge;

Figure 4 is a composite perspective view of the cartridge body and its two end closures;-

Figure 5 is a vertical sectional view of a typical grease gun barrel and plunger, the cartridge of the present invention being shown as being partially inserted therein;

Figure 6 is a similar view showing the cartridge completely inserted in the gun barrel;

Figure '7 is a similar view showing the action of the cartridge body as the gun plunger is advanced in to the gun barrel; and,

Figure 8 is a fragmentary perspective view of the gun barrel, and illustrating how the empty cartridge may be radially collapsed for removal therefrom.

Like characters of reference designate like parts in all of the figures wherein they occur.

In the drawings:

Reference numeral 1 indicates as a whole a tubular metal barrel constiuting a. portion of a usual grease or caulking gun. The barrel I has at one end a removable closure 2 with an exhaust opening 3 for the plastic or pliable material to be dispensed thereby, and having attached to said closure 2 a pressure operated exhaust mechanism 4. The opposite end 5 of the barrel I has a remove able cap reciprocatably mounting a piston rod I bearing upon its inner end a usual piston or plunger 8. In the present instance the plunger is shown as consisting of twov oppositely faced cup members. The mechanism .thus far described is intended to disclose a typical gun for the purposes set forth and is not a part of the present invention, per se. v The cartridge of the present invention is designed to contain a plastic commodity to be dispensed by the gun, above described, so that the gun may be expediently loaded with the commodity. The cartridges. per se consists substan'- tially of a tubate body I0 being mounted somewhat conical in from and having a reduced end I I and alarge end l2.

As best seen in Figs. 1, 4 and 8 the body I0 is formed by rolling a single rectangular sheet l3 of paper or similar material into one single convolution, and eccentrical with relation to its lon 3 gitudinal extent. The body thus produced is smaller at the end ll than it is at the end l2, and a strip I 4 of gummed paper, or similar material, is pasted along the exterior edge of the body to hold the sheet in its rolled condition.

It is pointed out that the body I is substantially the same length as the barrel l of the gun, but that the end l2 of the body II) is slightly larger in inside-diameter than the inside diameter of the barrel I. The result is that the body l0 when placed in the barrel I does not pass immediately inward to the end 2 of the barrel but extends a distance beyond the end 5 of the barrel l equal substantially to the over-all length of the plunger 8. r

The body I0 is provided with slightly tapered end closures I5 and 16 which are removably in-' serted into the body after it has been filled with the plastic commodity, and which are removed therefrom before the filled cartridge is inserted into the gun barrel I. The closures I5 and [6 are cup-shaped, and the closure 16 is of a length substantially equal to the over-all length of the piston or plunger 8.

In installing the cartridge in the barrel 1 of the gun the closures I5 and I6 are removed and the piston or plunger 8 is placed in the open enlarged end 12 of the body I0 to-the point at which it contacts the plastic commodity in the body. The body is then inserted into the barrel 1 until the plunger 8 is slightly within the end 5 of the barrel I. The plunger and body are then moved completely into the barrel l and the cap 6 of the gun is screwed or forced in place. The gun is then in condition for use. .Movement of the plunger 8 through action of the rod 1 toward the exhaust end of the barrel I will cause the paper strip M to split longitudinally as the plunger advances in the body 10. In order to facilitate the splitting of the strip 14 it may be secured or weakened along the dotted line H, (Fig. 7) As the strip I 4 splits'open the body I 0 assumes a cylindrical form conforming to the inside surface of the barrel I, and the edges of the sheet l3 meet and co-incide to form a smooth wall within which the piston 8 may travel. When the piston 8 has travelled to the closure 2 of the barrel I, and the plastic commodity has therefore all been ex hausted', the cup is removed from thebarrel and the piston withdrawn. If the body In does not freely withdraw from the barrel 1 when the plunger is withdrawn, the meeting edges of the sheet 13 may be mismated as shown in Fig. 8 and the sheet then is free to be withdrawn from the barrel 1. The dotted lines in Fig. 1 illustrate the approximate position and the edges of the sheet I3 as they occur when the body Ill has been completely formed.

It may be found desirable to leave the closure I6 in the body In during the above described operation so that the closure It will advance with the plunger 8. This operation is illustrated in Figs. 5 and 6.

From the above description it may readily be seen that a cartridge has been provided in which its entire contents may beexhausted from the gun without any loss whatsoever, and one which will be easily removed from the gun barrel after DOSE.

the commodity has been exhausted therefrom. It will further be apparent that, since the barrel I backs up the outside surface of the cartridge there is no occasion for the cartridge to be made of a heavy or rigid material, and consequently there is little or no loss in throwing away the paper body after it is used.

Experimentation has shown that material such as common paper, or waxed or oil paper are practical for constructing the body 10,- and that cellophane is also practical commodity for this pur- The word paper as used herein is intended to mean any suitable material or similar nature.

I claim:

, 1. A cartridge for grease guns, including: a

tapered tubate body of paper adapted to contain a pliable material; a removable closure for each end of the body; and a weakened longitudinal line of cleavage carried by the body.

2. A cartridge for grease guns, including: a tapered tubate body formed by an eccentrically rolled rectangular paper sheet; a strip of tearable material extending longitudinally of said body and holding the sheet in its rolled condition; and a weakened longitudinal line, of cleavage carried by the strip.

3. A cartridge for grease guns, including: a tapered tubate body formed by an eccentrically rolled rectangular paper sheet, a removable clo sure for each end of the body; a strip of tearable material extending longitudinally of said body and holding the sheet in its rolled condition; and a weakened longitudinal line of cleavage carried by the, strip. 7 4. Organization as described in claim 3, in which the body is formed by a single convolution of the paper sheet. 1

'5. A cartridge for grease guns, including: a tubate body of paper adapted to contain a pliable material, and having an exhaust end, said body tapered toward said exhaust end; a removable closure for each end of the body; and a weakened longitudinal line of cleavage extending along said body. a

6. A cartridge for grease guns, including: a tubate body of paper adapted to contain a pliable material, and having an exhaust end, said body tapered toward said exhaust end; and a weakened longitudinal line of cleavage extending along said body.

' ARCH W. MCCARTY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

